JPWO2021246292A5 - - Google Patents

Claims (16)

a shaft having a distal end and a proximal end and having a longitudinally extending lumen;
a first wire and a second wire having a distal end and a proximal end, the distal end being fixed to the distal end of the shaft, the proximal end being disposed at the proximal end of the shaft, and extending into a lumen of the shaft;
a leaf spring disposed in the inner cavity of the shaft so as to separate the inner cavity of the shaft in the longitudinal direction into a first portion in which the first wire is disposed and a second portion in which the second wire is disposed;
a support member extending in the longitudinal direction, having an inner cavity in which the first wire and the second wire are disposed, to which a proximal end of the leaf spring is fixed, and disposed proximally of the leaf spring;
a first coil having an inner lumen in which the first wire is disposed;
the first coil is disposed within the first portion distal to a distal end of the support member and not disposed within the second portion, and is disposed proximal to the leaf spring and not disposed distal to the leaf spring in the longitudinal direction;
A catheter comprising the first coil, the first coil having a total length _L1 in a natural state and a total length _Lc1 at maximum compression, the ratio _Lc1 / _L1 being 0.9 or greater. 2. The catheter according to claim 1, wherein the first coil is fixed to the proximal end side of the leaf spring at at least two points, and has a first fixed portion where the first coil and the leaf spring are fixed, a second fixed portion located proximal to the first fixed portion where the first coil and the leaf spring are fixed, and an intermediate non-fixed portion located between the first fixed portion and the second fixed portion and not fixed to the leaf spring. The catheter according to claim 1 or 2 , wherein the support member is a tube or a coil . The catheter of claim 1 , wherein the first coil is non-compressible. The catheter according to any one of claims 1 to 4 , wherein a portion where the first coil and the leaf spring are fixed is located on a surface of the first coil facing one surface of the leaf spring. The catheter according to any one of claims 1 to 5, wherein a non-fixed portion of the first coil that has the longest longitudinal length has a length in the longitudinal direction in its natural state that is 50% or more of the total length _L1 of the first coil in its natural state. The catheter according to any one of claims 1 to 6, wherein the first coil further has a distal non-fixed portion between a distal end of the first coil and the first fixed portion, the distal non-fixed portion not having a fixed portion that fixes the first coil and the leaf spring. The catheter according to any one of claims 1 to 7, further comprising a second coil, the second coil having an inner lumen in which the first wire is disposed, and disposed within the first portion and distal to the first coil. The catheter of claim 8 , wherein the second coil has a total length L ₂ in a resting state and a total length L _C2 at maximum compression, the ratio L _C2 /L ₂ being less than 0.9. 10. The catheter according to claim 8 , wherein the bending rigidity of the first coil is greater than the bending rigidity of the second coil, and the difference between the bending rigidity of the first coil and the bending rigidity of the second coil is 50% or less. the first coil includes a first coil wire wound in a helical shape;
the second coil includes a helically wound second coil wire;
The catheter according to any one of claims 8 to 10 , wherein the pitch interval of the first coil is smaller than the pitch interval of the second coil. The catheter of claim 11 , wherein a coil wire diameter and a coil diameter of the first coil are the same as a coil wire diameter and a coil diameter of the second coil. The catheter according to any one of claims 1 to 12 , further comprising a third coil, the third coil having an inner lumen in which the second wire is disposed, and disposed in the second portion. 14. The catheter of claim 13 , wherein the third coil has a total length _L3 in a resting state and a total length _Lc3 at maximum compression, _Lc3 / _L3 being less than 0.9. a second coil having an inner lumen in which the first wire is disposed and disposed distal to the first coil in the first section;
a third coil, the third coil having an inner lumen in which the second wire is disposed, the third coil being disposed in the second portion;
The catheter according to any one of claims 1 to 14, further comprising a protective tube having an inner lumen and disposed within the shaft lumen, the protective tube having the leaf spring, the first coil, the second coil, and the third coil disposed within the inner lumen. The catheter according to any one of claims 1 to 15 , wherein the first coil is fixed at the first fixing portion and the second fixing portion by welding, soldering, adhesion, or crimping.